POV 3.5 b7 on PII 233 128 MB with NT 4.0 Sp 6 

It's nothing important but when script contains refference (i.e. with #fopen ...
write) to file in not existing directory then "Cannot open user file" error is
returned from parser. When I create this directory and return to POV and click
on Render button again then the parser works fine, renderer works fine but after
rendering the line in script with #fopen line is still highlighted.

ABX
--
#declare _=function(a,b,x){((a^2)+(b^2))^.5-x}#default {pigment{color rgb 1}}
union{plane{y,-3}plane{-x,-3}finish{reflection 1 ambient 0}}isosurface{ //ABX
function{_(x-2,y,1)|_((x+y)*.7,z,.1)|_((x+y+2)*.7,z,.1)|_(x/2+y*.8+1.5,z,.1)}
contained_by{box{<0,-3,-.1>,<3,0,.1>}}translate z*15finish{ambient 1}}//POV35

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